ST7FL15F1MAE STMICROELECTRONICS [STMicroelectronics], ST7FL15F1MAE Datasheet - Page 21

• Manufacturer Part Number: ST7FL15F1MAE
• Description: 8-bit MCU for automotive with single voltage Flash/ROM memory, data EEPROM, ADC, 5 timers, SPI
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

7 SUPPLY, RESET AND CLOCK MANAGEMENT
The device includes a range of utility features for
securing the application in critical situations (for
example, in case of a power brown-out) and re-
ducing the number of external components.
Main features
■
■
■
7.1 INTERNAL RC OSCILLATOR ADJUSTMENT
The device contains an internal RC oscillator with
an accuracy of 1% for a given device, temperature
and voltage range (4.5V to 5.5V). It must be cali-
brated to obtain the frequency required in the ap-
plication. This is done by the software writing a 10-
bit calibration value in the RCCR (RC Control Reg-
ister) and in the bits 6:5 in the SICSR (SI Control
Status Register).
Whenever the microcontroller is reset, the RCCR
returns to its default value (FFh), that is, each time
the device is reset, the calibration value must be
loaded in the RCCR. Predefined calibration values
are stored in EEPROM for 3.3V and 5V V
ply voltages at 25°C, as shown in the following ta-
ble.
Clock Management
– 1 MHz internal RC oscillator (enabled by op-
– 1 to 16 MHz External crystal/ceramic resona-
– External Clock Input (enabled by option byte)
– PLL for multiplying the frequency by 8 or 4
Reset Sequence Manager (RSM)
System Integrity Management (SI)
– main supply Low Voltage Detection (LVD)
tion byte
tor
(enabled by option byte). Only multiplying by 8
is available for ROM devices.
with reset generation (enabled by option byte)
DD
sup-
Note:
1. DEE0h, DEE1h, DEE2h, and DEE3h addresses are lo-
cated in a reserved area but are special bytes containing
also the RC calibration values which are read-accessible
only in user mode. If all the EEPROM data or Flash space
(including the RC calibration value locations) has been
erased (after the readout protection removal), then the
RC calibration values can still be obtained through these
four addresses.
For compatibility reasons with the SICSR register,
CR[1:0] bits are stored in the fifth and sixth position of the
DEE1 and DEE3 addresses.
Notes:
– In 38-pulse ICC mode, the internal RC oscillator
– For more information on the frequency and accu-
– To improve clock stability and frequency accura-
– These bytes are systematically programmed by
Caution: If the voltage or temperature conditions
change in the application, the frequency may need
to be recalibrated.
Refer to application note AN1324 for information
on how to calibrate the RC frequency using an ex-
ternal reference signal.
RCCRH0
RCCRL0
RCCRH1
RCCRL1
is forced as a clock source, regardless of the se-
lection in the option byte. For ST7L1 devices
which do not support the internal RC oscillator,
the “option byte disabled” mode must be used
(35-pulse ICC mode entry, clock provided by the
tool).
racy of the RC oscillator see
CHARACTERISTICS” on page
cy, it is recommended to place a decoupling ca-
pacitor, typically 100nF, between the V
V
ST, including on FASTROM devices.
SS
RCCR
pins as close as possible to the ST7 device.
V
T
f
V
T
f
RC
RC
A
A
DD
DD
= 25°C
= 25°C
Conditions
= 1 MHz
= 1 MHz
= 5V
= 3.3V
ST7L15, ST7L19
“ELECTRICAL
98.
DEE0h
DEE1h
DEE2h
DEE3h
Address
ST7L1
1)
1)
1)
1)
DD
(CR[9:2])
(CR[1:0])
(CR[9:2])
(CR[1:0])
and
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